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/* Copyright (C) 2015-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <bits/wordsize.h>
#include <kernel-features.h>
/* By default only shared builds use vdso. */
#ifndef ALWAYS_USE_VSYSCALL
#define ALWAYS_USE_VSYSCALL 0
#endif
#define USE_VSYSCALL (defined (SHARED) || ALWAYS_USE_VSYSCALL)
/* Set error number and return -1. A target may choose to return the
internal function, __syscall_error, which sets errno and returns -1.
We use -1l, instead of -1, so that it can be casted to (void *). */
#define INLINE_SYSCALL_ERROR_RETURN_VALUE(err) \
({ \
__set_errno (err); \
-1l; \
})
/* Provide a dummy argument that can be used to force register
alignment for register pairs if required by the syscall ABI. */
#ifdef __ASSUME_ALIGNED_REGISTER_PAIRS
#define __ALIGNMENT_ARG 0,
#define __ALIGNMENT_COUNT(a,b) b
#else
#define __ALIGNMENT_ARG
#define __ALIGNMENT_COUNT(a,b) a
#endif
/* Provide a common macro to pass 64-bit value on syscalls. */
#if __WORDSIZE == 64 || defined __ASSUME_WORDSIZE64_ILP32
# define SYSCALL_LL(val) (val)
# define SYSCALL_LL64(val) (val)
#else
#define SYSCALL_LL(val) \
__LONG_LONG_PAIR ((val) >> 31, (val))
#define SYSCALL_LL64(val) \
__LONG_LONG_PAIR ((long) ((val) >> 32), (long) ((val) & 0xffffffff))
#endif
/* Provide a common macro to pass 64-bit value on pread and pwrite
syscalls. */
#ifdef __ASSUME_PRW_DUMMY_ARG
# define SYSCALL_LL_PRW(val) 0, SYSCALL_LL (val)
# define SYSCALL_LL64_PRW(val) 0, SYSCALL_LL64 (val)
#else
# define SYSCALL_LL_PRW(val) __ALIGNMENT_ARG SYSCALL_LL (val)
# define SYSCALL_LL64_PRW(val) __ALIGNMENT_ARG SYSCALL_LL64 (val)
#endif
/* Provide a macro to pass the off{64}_t argument on p{readv,writev}{64}. */
#define LO_HI_LONG(val) \
(long) (val), \
(long) (((uint64_t) (val)) >> 32)
/* Exports the __send symbol on send.c linux implementation (some ABI have
it missing due the usage of a old generic version without it). */
#define HAVE_INTERNAL_SEND_SYMBOL 1
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